ip_id_offset.c File Reference

Offset IP-ID decoding. More...

#include "ip_id_offset.h"
#include <stdlib.h>
#include <assert.h>

Include dependency graph for decomp/schemes/ip_id_offset.c:

Data Structures
struct	ip_id_offset_decode
	Defines a IP-ID object to help computing the IP-ID value from an IP-ID offset. More...
Functions
struct ip_id_offset_decode *	ip_id_offset_new (void)
	Create a new Offset IP-ID decoding context.
void	ip_id_offset_free (struct ip_id_offset_decode *const ipid)
	Destroy a given Offset IP-ID decoding context.
bool	ip_id_offset_decode (const struct ip_id_offset_decode const ipid, const rohc_lsb_ref_t ref_type, const uint16_t m, const size_t k, const uint32_t sn, uint16_t const decoded)
	Decode the given IP-ID offset.
void	ip_id_offset_set_ref (struct ip_id_offset_decode *const ipid, const uint16_t id_ref, const uint32_t sn_ref, const bool keep_ref_minus_1)
	Update the reference values for the IP-ID and the SN.

Detailed Description

Offset IP-ID decoding.

Author:: Didier Barvaux <didier.barvaux@toulouse.viveris.com>; Didier Barvaux <didier@barvaux.org>

bool ip_id_offset_decode	(	const struct ip_id_offset_decode *const	ipid,
		const rohc_lsb_ref_t	ref_type,
		const uint16_t	m,
		const size_t	k,
		const uint32_t	sn,
		uint16_t *const	decoded
	)

Decode the given IP-ID offset.

Parameters:

	ipid	The Offset IP-ID object
	ref_type	The reference value to use to decode (used for context repair upon CRC failure)
	m	The IP-ID offset to decode
	k	The number of bits used to code the IP-ID offset
	sn	The SN of the ROHC packet that contains the IP-ID offset
	decoded	OUT: The computed IP-ID

void ip_id_offset_free ( struct ip_id_offset_decode *const ipid )

Destroy a given Offset IP-ID decoding context.

See 4.5.5 in the RFC 3095 for details about Offset IP-ID encoding.

Parameters:

ipid

The Offset IP-ID decoding context to destroy

struct ip_id_offset_decode* ip_id_offset_new ( void ) [read]

Create a new Offset IP-ID decoding context.

See 4.5.5 in the RFC 3095 for details about Offset IP-ID encoding.

Returns:: The new Offset IP-ID decoding context in case of success, NULL otherwise

void ip_id_offset_set_ref	(	struct ip_id_offset_decode *const	ipid,
		const uint16_t	id_ref,
		const uint32_t	sn_ref,
		const bool	keep_ref_minus_1
	)

Update the reference values for the IP-ID and the SN.

Parameters:

	ipid	The Offset IP-ID decoding object
	id_ref	The new IP-ID reference
	sn_ref	The new SN reference
	keep_ref_minus_1	Keep ref -1 unchanged (used for SN context repair after CRC failure, see RFC3095 §5.3.2.2.5)